• In his speech, President Barack Obama said the United States will no longer define its relations with Pakistan narrowly and that the partnership will be built on mutual interest, respect and trust.

    VOA: standard.2009.12.06

  • What we define as zero is the enthalpy of every element in its natural state at room temperature and ambient pressure.

    我们将零点定义为每种元素,在室温和正常大气压下,在其自然状态下的焓。

    麻省理工公开课 - 热力学与动力学课程节选

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